/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2007 The JRuby Community
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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package org.jruby.runtime.load;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.jruby.Ruby;
import org.jruby.ast.executable.Script;
import org.jruby.runtime.Block;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.JRubyClassLoader;
import org.objectweb.asm.ClassReader;

public class JavaCompiledScript implements Library {
    private final LoadServiceResource resource;
    
    public JavaCompiledScript(LoadServiceResource resource) {
        this.resource = resource;
    }

    public void load(Ruby runtime, boolean wrap) {
        InputStream in = null;
        try {
            in = new BufferedInputStream(resource.getURL().openStream());
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buf = new byte[8196];
            int read = 0;
            while ((read = in.read(buf)) != -1) {
                baos.write(buf, 0, read);
            }
            buf = baos.toByteArray();
            JRubyClassLoader jcl = runtime.getJRubyClassLoader();
            ClassReader cr = new ClassReader(buf);
            String className = cr.getClassName().replace('/', '.');

            Class clazz = null;
            try {
                clazz = jcl.loadClass(className);
            } catch (ClassNotFoundException cnfe) {
                clazz = jcl.defineClass(className, buf);
            }
            
            // if it's a compiled JRuby script, instantiate and run it
            if (Script.class.isAssignableFrom(clazz)) {
                ((Script)clazz.newInstance()).load(runtime.getCurrentContext(), runtime.getTopSelf(), IRubyObject.NULL_ARRAY, Block.NULL_BLOCK);
            }
        } catch (IOException e) {
            throw runtime.newIOErrorFromException(e);
        } catch (InstantiationException ie) {
            throw runtime.newLoadError("Error loading compiled script: " + ie);
        } catch (IllegalAccessException iae) {
            throw runtime.newLoadError("Error loading compiled script: " + iae);
        } finally {
            try {
                in.close();
            } catch (IOException ioe) {
                throw runtime.newIOErrorFromException(ioe);
            }
        }
    }
}
